Q. In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

View solution

Q. For what value of Prandtl number, the Col-burn analogy is valid ?

View solution

Q. In a forward feed multiple effect, the pressure build up will be

View solution

Q. Film boiling occurs at __________ pressure.

View solution

Q. Heat flux through several resistances in series in analogous to the current flowing through several

View solution

Q. Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

View solution

Q. Vacuum is generally maintained in the vapour space of an evaporator mainly to

View solution

Q. Double pipe heat exchangers are used

View solution

Q. Steam traps are provided in steam carrying pipelines to

View solution

Q. A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an

View solution

Q. Radiation heat transfer rates does not depend upon the

View solution

Q. Which of the following is correct ?

View solution

Q. Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

View solution

Q. As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

View solution

Q. Heat transfer rate per unit area is called

View solution

Q. Log mean temperature difference (LMTD) cannot be used, if

View solution

Q. The critical radius 'r' of insulation on a pipe is given by

View solution

Q. As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the

View solution

Q. If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

View solution

Q. The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by

View solution